CN104857829A - Technology and system for treating hydrochloric acid regeneration device tail gas - Google Patents
Technology and system for treating hydrochloric acid regeneration device tail gas Download PDFInfo
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- CN104857829A CN104857829A CN201510256128.9A CN201510256128A CN104857829A CN 104857829 A CN104857829 A CN 104857829A CN 201510256128 A CN201510256128 A CN 201510256128A CN 104857829 A CN104857829 A CN 104857829A
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- tail gas
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Abstract
The invention relates to a technology and a system for treating hydrochloric acid regeneration device tail gas. The technology comprises steps as follows: 1) the hydrochloric acid regeneration device tail gas coming out of an absorption tower enters a condenser to indirectly exchange heat with cooling water, and condensate formed after condensation of part of water vapor in the tail gas enters a collecting water tank to be used as a spraying liquid of the absorption tower; 2) the cooling water is heated through heat exchange, then enters a cooling tower and returns to the condenser for recycling after cooled again; 3) the tail gas comes out of the condenser, is pressurized by a smoke exhaust fan and enters an alkaline washing tower, hydrochloric acid in the alkaline washing tower is thoroughly neutralized, and the acid content of the finally discharged tail gas is smaller than or equal to 10 mg/m<3>. With the adoption of the technology and the system, up-to-standard discharge of the hydrochloric acid regeneration device tail gas is realized, meanwhile, the process cooling water can be recycled, the condensate is used as the spraying liquid of the absorption tower, so that water for washing is saved, and power consumption is reduced; the total discharge amount of the tail gas can be reduced, the load of the smoke exhaust fan is reduced, and the technology is simple and easy to implement, low in investment and particularly applicable to transformation of old plants, takes effect quickly and is another good method worthy of popularization for energy conservation and emission reduction.
Description
Technical field
The present invention relates to metallurgy industry hydrochloric acid regenerating device energy-conserving and emission-cutting technology field, particularly relate to a kind of hydrochloric acid regenerating device tail gas treatment process and treatment system.
Background technology
The hydrochloric acid regenerating device tail gas treatment process generally adopted at present is: about the 395 DEG C high-temperature furnace gas of discharging from hydrochloric acid regenerating device roaster, in preconcentrator, spray spent acid through circulation cool to about 97 DEG C, then absorption tower is entered, scrubbing tower contacts with top spray water is reverse, absorb, washing sour gas, the sour furnace gas that contains now is become steam by water saturation, air is entered from device chimney, discharge containing after sour water steam condensing Cheng Shui falls, certain corrosion is caused to equipment near plant area and building, environment is worked the mischief, especially the resident's suggestion around plant area is larger.In order to avoid this environmentally hazardous phenomenon occurs, we transform common process, have developed tail gas condensing, alkali cleaned acid new technology, under the prerequisite not changing existing hydrochloric acid regenerating device building and main equipment layout, condenser is increased behind absorption tower, change scrubbing tower into caustic wash tower, outer last person's gas acid content is controlled at≤10mg/m
3, lower than national tail gas acid content≤30mg/m
3new standard, decrease tail gas total release simultaneously, reduce smoke exhaust fan load, save slurry and power consumption.Go into operation through reality and run, achieve good economic benefit and social benefit; Present invention process is simple, small investment, instant effect, is specially adapted to modernize and expand the existing factory, and is the good method that the another item of energy-saving and emission-reduction is worthy to be popularized.
Summary of the invention
The invention provides a kind of hydrochloric acid regenerating device tail gas treatment process, absorption tower being lowered the temperature by condenser heat exchange containing sour furnace gas out, then enter caustic wash tower and carry out neutralization reaction, make outer last person's gas acid content≤10mg/m
3, cooling water circulation uses, and condensate liquid uses as the flushing liquor on absorption tower, saves slurry and power consumption; The present invention also can reduce tail gas total release, reduces smoke exhaust fan load, and simple for process, is an energy-saving and emission-reduction new technology; Invention also provides the treatment system based on this technique.
In order to achieve the above object, the present invention realizes by the following technical solutions:
A kind of hydrochloric acid regenerating device tail gas treatment process, comprises the steps:
1) from absorption tower hydrochloric acid regenerating device tail gas out enter condenser with cooling water indirect heat exchange, by the tail gas condensing of more than 90 DEG C to less than 40 DEG C, the condensed condensate liquid of part water vapour in tail gas enters collects the flushing liquor of water pot as absorption tower;
2) be warmed up to 35 ~ 37 DEG C after cooling water inlet temperature 30 ~ 32 DEG C of heat exchange, then remove cooling tower, return condenser after being again cooled to 30 ~ 32 DEG C again and recycle, during this period regular replenishment evaporation water;
3) enter caustic wash tower through smoke exhaust fan pressurization after furnace gas goes out condenser, alkali liquid washing tail gas is sprayed in the circulation of alkali cleaning circulating pump, and tail gas is reverse with NaOH solution in caustic wash tower to be contacted, thoroughly neutralization hydrochloric acid wherein, the tail gas acid content≤10mg/m of final discharge
3.
Described cooling water accesses from condenser, overflows from top, and the flow direction of water i.e. reverse heat-exchange contrary to the flow direction of furnace gas, condensate drain is located at furnace gas export side.
From condenser tail gas acid content≤30mg/m out
3in time, directly can discharge without caustic wash tower, otherwise enters caustic wash tower and process further.
PH detector established by caustic wash tower bottom circulating slot, when PH detector indicating liquid is neutral, opened by bleeder valve, discharges salt solution from groove bottom, then unloads alkali pump and opens the numerical value termination of pumping adding alkali and specify to liquid level gauge in groove.
For realizing a kind for the treatment of system of hydrochloric acid regenerating device tail gas treatment process, comprise absorption tower, condenser and caustic wash tower, the offgas outlet on described absorption tower connects the gas access of condenser, and the gas vent of condenser connects the gas inlet of caustic wash tower by smoke exhaust fan; The cooling water inlet of condenser is connected the cooling water inlet of condenser with cooling water circulating pump by cooling tower; The condensate outlet of condenser is connected the flushing liquor pipeline on absorption tower with condensate circulation pump by collecting water pot; The alkali wash water circulation conveyance conduit of caustic wash tower is provided with alkali cleaning circulating pump, and caustic wash tower bottom alkali wash water circulating slot connects alkali storage tank by unloading alkali pump.
Described condenser is horizontal pipe bundle condenser, and heat exchanger tube adopts graphite modified PP material, and housing adopts the manufacture of PPH material.
Coolant outlet on described condenser, cooling water inlet and gas vent, gas access place all establish temperature and pressure monitoring device, are monitored by computer picture.
Described cooling tower is adverse current glass fibre reinforced plastics cooling tower.
Compared with prior art, the invention has the beneficial effects as follows:
1) absorption tower being lowered the temperature by condenser heat exchange containing sour furnace gas out, then enter caustic wash tower and carry out neutralization reaction, make outer last person's gas acid content≤10mg/m
3, lower than national tail gas acid content≤30mg/m
3new standard, environmental protect pollution situation;
2) cooling water circulation uses, and condensate liquid uses as the flushing liquor on absorption tower, saves slurry and power consumption; Also can reduce tail gas total release, reducing smoke exhaust fan load, is an energy-saving and emission-reduction new technology;
3) simple for process, small investment, instant effect, is specially adapted to modernize and expand the existing factory, and economic benefit and social benefit are given prominence to.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
In figure: 1. absorption tower 2. condenser 3. smoke exhaust fan 4. caustic wash tower 5. alkali cleaning circulating pump 6. alkali storage tank 7. unloads alkali pump 8. cooling tower 9. cooling water circulating pump 10. and collects water pot 11. condensate circulation pump
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Seeing Fig. 1, is process chart of the present invention, and a kind of hydrochloric acid regenerating device tail gas treatment process of the present invention, comprises the steps:
1) from absorption tower 1 hydrochloric acid regenerating device tail gas out enter condenser 2 with cooling water indirect heat exchange, by the tail gas condensing of more than 90 DEG C to less than 40 DEG C, the condensed condensate liquid of part water vapour in tail gas enters collects the flushing liquor of water pot 10 as absorption tower 1;
2) be warmed up to 35 ~ 37 DEG C after cooling water inlet temperature 30 ~ 32 DEG C of heat exchange, then remove cooling tower 1, return condenser 2 after being again cooled to 30 ~ 32 DEG C again and recycle, during this period regular replenishment evaporation water;
3) caustic wash tower 4 is entered through smoke exhaust fan 3 pressurization after furnace gas goes out condenser 2, alkali cleaning circulating pump 5 circulates and sprays alkali liquid washing tail gas, tail gas is reverse with NaOH solution in caustic wash tower 4 to be contacted, thoroughly neutralization hydrochloric acid wherein, the tail gas acid content≤10mg/m of final discharge
3.
Described cooling water, from the access of condenser 2 bottom, overflows from top, and the flow direction of water i.e. reverse heat-exchange contrary to the flow direction of furnace gas, condensate drain is located at furnace gas export side.
From condenser 2 tail gas acid content≤30mg/m out
3in time, directly can discharge without caustic wash tower 4, otherwise enters caustic wash tower 4 and process further.
PH detector established by caustic wash tower 4 bottom circulating slot, when PH detector indicating liquid is neutral, opened by bleeder valve, discharges salt solution from groove bottom, then unloads alkali pump 7 and opens the numerical value termination of pumping adding alkali and specify to liquid level gauge in groove.
Treatment system for realizing a kind of hydrochloric acid regenerating device tail gas treatment process of the present invention, comprise absorption tower 1, condenser 2 and caustic wash tower 4, the offgas outlet on described absorption tower 1 connects the gas access of condenser 2, and the gas vent of condenser 2 connects the gas inlet of caustic wash tower 4 by smoke exhaust fan 3; The cooling water inlet of condenser 2 is connected the cooling water inlet of condenser 2 by cooling tower 1 and cooling water circulating pump 9; The condensate outlet of condenser 2 is connected the flushing liquor pipeline on absorption tower 1 with condensate circulation pump 11 by collecting water pot 10; The alkali wash water circulation conveyance conduit of caustic wash tower 4 is provided with alkali cleaning circulating pump 5, and caustic wash tower 4 bottom alkali wash water circulating slot connects alkali storage tank 6 by unloading alkali pump 7.
Described condenser 2 is horizontal pipe bundle condenser, and heat exchanger tube adopts graphite modified PP material, and housing adopts the manufacture of PPH material.
Coolant outlet on described condenser 2, cooling water inlet and gas vent, gas access place all establish temperature and pressure monitoring device, are monitored by computer picture.
Described cooling tower 8 is adverse current glass fibre reinforced plastics cooling tower.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
[embodiment]
In the present embodiment, heat exchanger tube in condenser 2 adopts the graphite modified polypropylene pipe of 1330 trades mark of Beijing Chemical Engineering College's development, preparation method is with 200 order superfine graphite powder, add in PP powder, addition is 45% of total amount, extruded with injection machine, the PP pipeline making heat conductivility poor is owing to the addition of the good graphite powder of heat transfer, heat transfer coefficient increases to 2.8 kilocalories/mh DEG C, has possessed under deep-etching condition, can be used for the condition making heat exchanger tube.In order to prevent condenser pipe local damage to seepage hcl corrosion equipment in cooling water, condenser 2 shell adopts the corrosion-resistant material of PPH.
In the present embodiment, hydrochloric acid regenerating device is conventional 6m
3the regenerating unit of/h scale, furnace gas amount: 20000m3/h behind absorption tower; Temperature: 90 DEG C; Total amount of heat is: 173635Kcal/h, and condenser heat exchange area is: F=Q/K. Δ t173635/28x23.7=261m
2, but the water yield is: 173635/37-32=34727Kg ≈ 35m
3, the outer discharge capacity 4448m of minimizing tail gas per hour
3, be equivalent to arrange 934Kg hydrochloric acid less to air every year.
Because furnace gas temperature has dropped to less than 40 DEG C, the water vapour part in furnace gas becomes condensate liquid, so the condensed water also corresponding minimizing fallen after discharging, obviously alleviates neighbouring equipment, building corrosion.
In the present embodiment, smoke exhaust fan 3 power of motor is 160KW, frequency control, and because furnace gas amount reduces energy-conservation 32KW per hour, fractional energy savings is 22%, works every year 7000 hours in hydrochloric acid regenerating device, and can economize on electricity 224000KWh every year; Generation condensate liquid 3m per hour in condensation process in addition
3left and right, for the flushing liquor on absorption tower 1 after being collected by collection water pot 10, because former scrubbing tower demineralized water sprays, flowing full water enters to collect water pot 10, so can save demineralized water 21000m every year
3.
As can be seen from the above data, after adopting technique of the present invention, exhaust treatment system correctional effect is obvious, achieves good economic benefit and social benefit.
Claims (8)
1. a hydrochloric acid regenerating device tail gas treatment process, is characterized in that, comprises the steps:
1) from absorption tower hydrochloric acid regenerating device tail gas out enter condenser with cooling water indirect heat exchange, by the tail gas condensing of more than 90 DEG C to less than 40 DEG C, the condensed condensate liquid of part water vapour in tail gas enters collects the flushing liquor of water pot as absorption tower;
2) be warmed up to 35 ~ 37 DEG C after cooling water inlet temperature 30 ~ 32 DEG C of heat exchange, then remove cooling tower, return condenser after being again cooled to 30 ~ 32 DEG C again and recycle, during this period regular replenishment evaporation water;
3) enter caustic wash tower through smoke exhaust fan pressurization after furnace gas goes out condenser, alkali liquid washing tail gas is sprayed in the circulation of alkali cleaning circulating pump, and tail gas is reverse with NaOH solution in caustic wash tower to be contacted, thoroughly neutralization hydrochloric acid wherein, the tail gas acid content≤10mg/m of final discharge
3.
2. a kind of hydrochloric acid regenerating device tail gas treatment process according to claim 1, it is characterized in that, described cooling water accesses from condenser, overflows from top, and the flow direction of water i.e. reverse heat-exchange contrary to the flow direction of furnace gas, condensate drain is located at furnace gas export side.
3. a kind of hydrochloric acid regenerating device tail gas treatment process according to claim 1, is characterized in that, from condenser tail gas acid content≤30mg/m out
3in time, directly can discharge without caustic wash tower, otherwise enters caustic wash tower and process further.
4. a kind of hydrochloric acid regenerating device tail gas treatment process according to claim 1, it is characterized in that, PH detector established by caustic wash tower bottom circulating slot, when PH detector indicating liquid is neutral, bleeder valve is opened, discharge salt solution from groove bottom, then unload alkali pump and open the numerical value termination of pumping adding alkali and specify to liquid level gauge in groove.
5. for realizing the treatment system of a kind of hydrochloric acid regenerating device tail gas treatment process according to claim 1, it is characterized in that, comprise absorption tower, condenser and caustic wash tower, the offgas outlet on described absorption tower connects the gas access of condenser, and the gas vent of condenser connects the gas inlet of caustic wash tower by smoke exhaust fan; The cooling water inlet of condenser is connected the cooling water inlet of condenser with cooling water circulating pump by cooling tower; The condensate outlet of condenser is connected the flushing liquor pipeline on absorption tower with condensate circulation pump by collecting water pot; The alkali wash water circulation conveyance conduit of caustic wash tower is provided with alkali cleaning circulating pump, and caustic wash tower bottom alkali wash water circulating slot connects alkali storage tank by unloading alkali pump.
6. a kind of hydrochloric acid regenerating device exhaust treatment system according to claim 5, is characterized in that, described condenser is horizontal pipe bundle condenser, and heat exchanger tube adopts graphite modified PP material, and housing adopts the manufacture of PPH material.
7. a kind of hydrochloric acid regenerating device exhaust treatment system according to claim 5, it is characterized in that, coolant outlet on described condenser, cooling water inlet and gas vent, gas access place all establish temperature and pressure monitoring device, are monitored by computer picture.
8. a kind of hydrochloric acid regenerating device exhaust treatment system according to claim 5, is characterized in that, described cooling tower is adverse current glass fibre reinforced plastics cooling tower.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510256128.9A CN104857829A (en) | 2015-05-18 | 2015-05-18 | Technology and system for treating hydrochloric acid regeneration device tail gas |
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|---|---|---|---|
| CN201510256128.9A CN104857829A (en) | 2015-05-18 | 2015-05-18 | Technology and system for treating hydrochloric acid regeneration device tail gas |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105624715A (en) * | 2016-02-29 | 2016-06-01 | 中冶南方工程技术有限公司 | Acid regeneration system achieving acid blending in temperature control self-adaptive manner and control method of acid regeneration system |
| CN107010598A (en) * | 2017-04-24 | 2017-08-04 | 鞍山创新废酸除硅再生工程有限公司 | A kind of highly concentrated pickle liquor regeneration technology and system |
| CN107574450A (en) * | 2017-10-20 | 2018-01-12 | 鞍山创新废酸除硅再生工程有限公司 | A kind of stainless steel acid-washing waste liquid renovation process and system |
| CN109621560A (en) * | 2019-01-13 | 2019-04-16 | 上海务宝智能装备有限公司 | A kind of acid regeneration tail gas clean-up and emission-reducing process and equipment |
| CN115228232A (en) * | 2022-06-22 | 2022-10-25 | 福建永荣科技有限公司 | Absorption process of hydrogen peroxide regeneration tail gas of hydration catalyst of olefin cyclohexanone device |
| CN116159410A (en) * | 2022-12-30 | 2023-05-26 | 浙江工程设计有限公司 | Gas-phase white carbon black tail gas treatment device and method |
| CN116159410B (en) * | 2022-12-30 | 2024-04-30 | 浙江工程设计有限公司 | Gas-phase white carbon black tail gas treatment device and method |
-
2015
- 2015-05-18 CN CN201510256128.9A patent/CN104857829A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105624715A (en) * | 2016-02-29 | 2016-06-01 | 中冶南方工程技术有限公司 | Acid regeneration system achieving acid blending in temperature control self-adaptive manner and control method of acid regeneration system |
| CN105624715B (en) * | 2016-02-29 | 2017-12-22 | 中冶南方工程技术有限公司 | The acid purification system and its control method of the adaptive complex acid of temperature control |
| CN107010598A (en) * | 2017-04-24 | 2017-08-04 | 鞍山创新废酸除硅再生工程有限公司 | A kind of highly concentrated pickle liquor regeneration technology and system |
| CN107010598B (en) * | 2017-04-24 | 2023-08-11 | 鞍山创鑫环保科技股份有限公司 | High-concentration acid washing waste liquid regeneration process and system |
| CN107574450A (en) * | 2017-10-20 | 2018-01-12 | 鞍山创新废酸除硅再生工程有限公司 | A kind of stainless steel acid-washing waste liquid renovation process and system |
| CN109621560A (en) * | 2019-01-13 | 2019-04-16 | 上海务宝智能装备有限公司 | A kind of acid regeneration tail gas clean-up and emission-reducing process and equipment |
| CN115228232A (en) * | 2022-06-22 | 2022-10-25 | 福建永荣科技有限公司 | Absorption process of hydrogen peroxide regeneration tail gas of hydration catalyst of olefin cyclohexanone device |
| CN116159410A (en) * | 2022-12-30 | 2023-05-26 | 浙江工程设计有限公司 | Gas-phase white carbon black tail gas treatment device and method |
| CN116159410B (en) * | 2022-12-30 | 2024-04-30 | 浙江工程设计有限公司 | Gas-phase white carbon black tail gas treatment device and method |
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Application publication date: 20150826 |